Find a builder to make your building structurally sound

RSJs support your new extension or other construction to ensure that your property is structurally sound. They are crucial parts of your building work that mustn't be ignored, and must be installed by a professional.  To see prices and availability for your job click Get quotes.

HaMuch is Excellent

Install an RSJ cost in NN15 - Sort by rates or availability

From £2,256

(last active 08/05/26)
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Kettering Mobile Sandblasting

Kettering Mobile Sandblasting are here to help customers who need an Extension Builder in NN15. We offer a competitive rate to complete all your ex...

From £2,072

(last active 08/05/26)
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I Plowright Brickwork

I Plowright Brickwork is an established extension buildering business in NN15. We come highly recommended and provide competitive quotes for your w...

From £2,168

(last active 23/11/25)
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Jogga Construction

Relax... you have found a reliable extension builder in NN15. Jogga Construction is a friendly and reliable company based in NN15 who consider no j...

From £1,960

(last active 23/11/25)
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GARY TAYLOR BUILDERS LTD

Experienced extension builder ready to quote for your work. GARY TAYLOR BUILDERS LTD is the best extension builder in NN15. No obligation free quot...

RSJ cost in NN15

Estimates for install an rsj near NN15

How much RSJs cost for supply and installation varies depending on the size, type and load-bearing properties, but in NN15 it ranges from £1,960 (GARY TAYLOR BUILDERS LTD based in NN15) to £2,256 (Kettering Mobile Sandblasting based in NN16).

Comparing extension builders estimates for fitting an RSJ gives you an idea of who will be better value but the best way to compare costs is to get actual quotes.

Get rates and quotes to install an RSJ in NN15 by posting a job with HaMuch and we will send it to extension builders in NN15.


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Estimates for common extension builder jobs in NN15;

Whether you’re looking to extend your kitchen with a side return extension or you want to convert your basement into a liveable space, read our cost guides to get an idea of how much each project costs before getting a more accurate quote from our database of reliable tradespeople.

More extensions & conversions cost guides...